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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '756ac80ff57d19378330c4e6d4fd9a739879be2458a5987a9d9e6ba699dcd860' 
  AND token = 'LnaG7JE8T1DKWjl3JkUQAOM0LDMoSiai9Ev4mH1B6Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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