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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c1744a4e3d42833ddba7a3318fe9c67fbd0bcfbb3c374cafa2d2acd049e2798' 
  AND token = 'T1dpQ0nCV9HGIlW5r4k9y35mczKnHzda8AuIcdxSzx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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