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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d98ea8e53e0154aa41faf85fc2fa5df81baa79b2aae85700974b9a3bf54be5b' 
  AND token = '7XVXX5sWzvfuWfrG/NI+awS1GWd8jnj7qoSMCOG6HCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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