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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c99116edd79f1006a703850c5d608a6cff1332eaf16921fdb8a9c594091ec94' 
  AND token = 'L0U/JceoWncfPAV56xIfrg4fjlbAZ1zxxjhDXxofeH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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