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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67ae7df87de530b74fc6939dd9e5d64902125723f29cbba06d1c27247f88bd27' 
  AND token = 'p+q39iUc2v+BvT7SJVgmszeM83Kf7eVsEqm0pVEsv6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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