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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7757f06d01deb0f904cc9c165ee0d6f7d7708de6f3d4023c5d7d97b5724c8fa7' 
  AND token = 'pAdr5Igw+h0St4cZ9+tKlubCwdRm7UCbubmjDfApQ1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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