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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68570020b65ce296fd9004d7588807a7c24efc1870828eb671fbee9ef7bf19ea' 
  AND token = 'ovJLKN29yeb/lSd4NzSgSLN2DP8OJT/pEEO2+TBT5po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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