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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '487cd3fdffd7c9bb28824c8abbfc7d86a962cab98060f43758398c00e01a08bd' 
  AND token = 'apfV7s+SkDD0N3b05szMPB8Qc2CVqAkfemCU7wVx5/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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