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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f33586ae28269d06cceb9c2b58bf46b48ab8ce25a85f551999196d1338dc2e5' 
  AND token = 'vjLtZMnXbFo7lLifYNgh+AlHA7V8vcjaESkcgaey5GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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