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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed866ce89d21c2e31fbd6bc6512d27830c0b80e2b81d460be6d08ee999399063' 
  AND token = '866v/lv3KEiYSocGMVx11il57eShtHvkRpiIi+uvNlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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