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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce1bfa153a2164a29c091da12541328369e0fe3b22b79375d0b4ae2933faa662' 
  AND token = 'BJwOoaoubgh0pbbftR2H/QT0pdPtp851Fw1qsVurj44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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