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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad8ce00967579eaa1a52b803b8996a80a18d803e031714b7d00b9e50c0b93ecb' 
  AND token = 'Ih6GqvXDqWQnWhMjTSaT8tM51H8YgfDENpWLUmEx/do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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