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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5749f9cd2bf935aea377a71a29af15094a97c3367aef6dbcd7591889b66d54f0' 
  AND token = 'UtlhXeIEXBr0lvKnuM2e/NTN29gL3KMkXSlPXo/WtKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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