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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eba29c47c444857b812883bc1acc350404fcbe2d965bc629912eca70e222e41e' 
  AND token = 'MfTdY7LCJ7EP03WinHNGGvS6+sRDagDU7fgGKeC07xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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