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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf844ef37f3add21298433903255ca9c2928d7b5446daa2342f0ed176d47f09f' 
  AND token = '7ZOCmvvwxLqJTQgkx4C1IMdAbzZz18y9O5dyobNe87c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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