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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41b77b4c6c844eec71ace21eac0f754f839a8aa85ba70cf8a28db88cd0163b50' 
  AND token = 'i3VO5pc3rbjhcL0gMyoL4Hr+uR6v47nAJCMy47LvW34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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