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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a462d434e4d9869de232375a381d34a7318e07e0af8f6a59285da70caa4b514f' 
  AND token = 'BVhyjMK+5Y25awykvm5IRa/PoWr/r+5ef+76MKjrsWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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