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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9342b93ca09c0455c3be3512433c5f3ad6ae21d0143221a0e8a41897b9785860' 
  AND token = 'pE78RbKsGuAg0Vdu8gMA+T4SCmPNuG5BN1Exb1XEyg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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