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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '462c2f7076df9b99fd93f9dffad45839a201835cadb53ac7831761ac629dd167' 
  AND token = '2TlEqTo/KkekjRBsBrNTPDXbikrA07aHCTLhSUXac3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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