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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c070db372bb3e1ff293be231a24a5b75d66e24903e821a8098d8fbd14ecd0068' 
  AND token = 'yFKF1Vatclwl66HRwwF0dqCT4TPM0WDUEPjWnLIcBkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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