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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '734222dfeb60b4e6533434a558a354fa91bfb0d18507c676c5802791340a515b' 
  AND token = 'sydI7n7JlyrD+I6fk7LFssIFSR57o7bCZjphQ8Pd/ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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