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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42095c7d0eddbc3db2cc7f13deac9a4d921aa6178d25782902e178fb99e14a03' 
  AND token = 'fwO3snmr7scciUu/P4K19szDGsEOA4lsWusSUt2ojlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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