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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99ef8b723c55918b965ded229f40744c2973d5aac94743e4cb1453b0b6023be0' 
  AND token = 'x7zdkpigzes+JqRx87q1DgMroLlzyo/PJxEPEz3XBS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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