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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faa51db7e1eee81fa97b11e715281b6e6e14655a5bac5d5caaf567ebffd1f6d1' 
  AND token = 'CmOWUrzjt/4k9R+Z1JcBHwu5DpbcHLRiufsHqo/oidU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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