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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '786ec7e39bdf8b3478caf944dfaa063213403cdaf81e8c5dd34112afd7ebc4b8' 
  AND token = 'BgCYySUNy5SX64EyH1bA29r4wyMOjMc9QEZKR60yfc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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