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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb06d007c33f90d6cc57ca8888dff5b88425f357a4c71ac269b9e5703b49c3f3' 
  AND token = 'ahJzBHNtpaa6+mAcXvn5AJe9gwZsk0a0e6uE2s0x3Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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