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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f62349f20f0871f9bda8f77a614f3cd0d1b5ea631cb0ff3ebae2a0348a1b1dc4' 
  AND token = 'npTN14Iia5Nd3Ig78w+OVdVWefhHj3IgydKo0jDEHuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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