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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e45aca13af671324b5c3d99e49dc0c9c060dc6d1fb4c60696b3ac2c208a8a73b' 
  AND token = '+SiHGCG+YVBxBM8ha+tWjZ6tI21hvccLq489FH8FdWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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