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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f9d47104a37c390d00999de7b540bbaecf91984afb96180cbec524fac427dcd' 
  AND token = 'GnjlbqT0jJ2Kg73gXA7Xs8Nurxf1xK4zFDiCvnxv+zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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