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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a5e2250faa66820908876b754f7efd44c27775a5be3e7bc1814224cb5176f6a' 
  AND token = '6H03cQeFVHXFOjTWINfG+FwS8E3Gdjnny04PU2c07AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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