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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fa2e1f6d83768c93832e98b2d7593642f3f1c5eb57c79209f7aa7d073390ff5' 
  AND token = '6oAtJf5EidC4pasnvaavdoR84YzL+4XEWieiDSYW3BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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