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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c0bb13ce04bfc7bcd6f4d2afb3e5cf2cd0716976761b9ddbc36d8c84b8052dc' 
  AND token = '2jZKOT459vzNPQ7Cc+C3PhCeBrA3fW4MtWFEUxqicAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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