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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5a039f448cdfec234a71855c6e1dfed2d4e29610f8898d39c1e2dfe49142c50' 
  AND token = 'Yequ4HLth1V1XIVFjST4OuhtaEJ7fbK/7461A2jvSB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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