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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e9b183e0dc8990b54d859c71cc8243ca64a54b643fceaf1d6c7623be3eb4eaf' 
  AND token = 'y6pTWypCxsBdBZpKO3chxPs/JXaGaL/LyfwHkIdLbjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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