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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7f16d6081e82ad70cd357352b684d579bdb66716468968152ebe863e4bd55bc' 
  AND token = '99av29Qh5TLl55U6pK632MumlsFQVfhhuI1bh0JAt8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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