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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97c02853fcafe05fce1a28ccc16b60b0c277c2d207dc06f2310f8d68c975516a' 
  AND token = 'R+Ky7Bxy7r8wBUC/NXhcCx14Oc7H/jFwzY+O2lag86U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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