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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c854d1e3b00d21f7b5794b3f00ff20afc422f7470c4bc88311ad8f7cdda41a67' 
  AND token = 'ClL0SPiy5Kmi8PQ8EqjOuSUlWr8gCpS2+lLWBdRFRmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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