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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43032079d2a92a44b8a436448f65223d6f7aa6de3257183126ee646f902fffa3' 
  AND token = 'ppbVCh9iBEi85NfYmAQYbVgoQ1xJTztmnrsXq2ROATM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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