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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dc8ceb246a1f7c056deb51a0dd6eb5986a8163f6fdbd6a2b5d9647a6e4d9d15' 
  AND token = 'wkknF+cpRoMh0HxiB9Oj/Ke4TTxOgBQfDtLw9M6f2ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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