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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d698d1333b5db731b59f50ed156a9aebc976bf50aaf1a9c2b1906d6d66f8526' 
  AND token = 'LVFqGSp0bgrTFgQMYp6fmFYqna6nWB2RyQJzA6ApsyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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