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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2ba32f33c8b21a9ea786ca266b2ec3bf326664981bdb6010782a702f32821ae' 
  AND token = 'dxyhtOro+6ybXhWWT+kOlqWNP7sj01mCSXacOjHYyoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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