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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31383dcd07fc13a678f8e5e02633553cbfe57915160f82e7ee71d4843fdabc38' 
  AND token = 'c2q6B86xMNeOfG+ddoJS3F17Zj3Q2nVxSBUulgxVa3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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