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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51c106264f6499e6376a00e22f99a4e9a2bfea0e7f0b24935882a33b1624ebe7' 
  AND token = 'b+m5/BshZ9bELsxto+u0CK+twao1C9CxqSCCgTwm9qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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