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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b814e8a1a86d0a38012ead4377619c2e2dbb5aa6b977738629cca4ac920c879b' 
  AND token = '0oWOBxWLxEXaUC+8HksuOWzthgj5KO/5aj6sZlkSlLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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