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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1aed2dac679c7a81a59298f12632e00d95c91ebf33dc90a27971a1c55b6e430e' 
  AND token = 'B+FDfbr/3dYI75s9kYBSHgIRMs1VxQQrbEfMw8KdKaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}