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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da042c9e8028e0277b324fac284a5f3c34912a82554beb5156e5408a1343b3b4' 
  AND token = 'ePDy7FaIsGQG/LofAMLXzMmAOWISf7ZsSMPCpK7qXH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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