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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3b17cc2453eab67c55dadb4b4ae6f39bd23a7dbc24844aa3defd334d44a1869' 
  AND token = 'tlj1V20uapS1gvoc+sFoVhTISr8oR/d29kXjWtY+nPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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