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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70ef3cedf05c961d6b998aee9f6239be2a6c00e20f364570bc733330e0db0bd6' 
  AND token = 'UMtWlEl1W5NS26sHbEdnApNppwMEvgSCyQCOy9T9zQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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